Tesla doubles the energy density for battery

While Tesla's solar roof / Powerwall event isn't until tomorrow, the product that preceded both, its commercial... cousin, Powerpack, has been upgraded and is already shipping to companies. The company says Powerpack 2 has double the energy density than the original model, paired with a new inverter (made at its Gigafactory), that's apparently the lowest-priced, highest efficiency utility-scale inverter available. Arguably just as important, the new inverter also simplifies the installation process, with several once-separate components now baked into it.

Tesla's blog calls the new system a "a cost-competitive alternative to other traditional utility infrastructure solutions". It adds that nearly 300 MWh of Tesla batteries have been deployed so far

source:  https://www.tesla.com/blog/gaining-momentum-tesla-powerpack